Constant Control Relay Module (CCRM) 12B577 Connector End View
Section 03-03: Engine Cooling | 1993 Mustang Workshop Manual |
Located in the engine compartment on RH shock tower.
Constant Control Relay Module (CCRM) 12B577 Connector End View
| Pin Number | Circuit | Circuit Function |
|---|---|---|
| 1 | 228 (DB) | Power to Cooling Fan Motor |
| 2 | 228 (DB) | Power to Cooling Fan Motor |
| 3 | 38 (BK/O) | B+ to Cooling Fan Relay |
| 4 | 38 (BK/O) | B+ to Cooling Fan Relay |
| 5 | 238 (DG/Y) | Power to Fuel Pump |
| 6 | — | NOT USED |
| 7 | — | NOT USED |
| 8 | 37 (Y) | B+ to Power Relay |
| 9 | — | NOT USED |
| 10 | — | NOT USED |
| 11 | — | NOT USED |
| 12 | 787 (PK/BK) | B+ to Fuel Pump Relay |
| 13 | 16 (R/LG) | Ignition Start/Run |
| 14 | 639 (LG/P) | Fan Control (FC) Input Ground |
| 15 | 57 (BK) | Ground |
| 16 | 321 (GY/W) | A/C Clutch Ground |
| 17 | — | NOT USED |
| 18 | 926 (LB/O) | Fuel Pump (FP) Input |
| 19 | — | NOT USED |
| 20 | — | NOT USED |
| 21 | 883 (PK/LB) | A/C Clutch Cycling Pressure Switch Input |
| 22 | 331 (PK/Y) | WOT A/C Cutout (WAC) |
| 23 | 347 (BK/Y) | Power to A/C Compressor Clutch |
| 24 | 361 (R) | Powertrain Control Module (PCM) 12A650 System Power Output |
Normal operation and cycling of the engine cooling fan will cause the temperature gauge indicator to read between the mid-point and upper portion of the temperature gauge scale. The slightly higher indicator reading will return to mid-point when fan operation begins.